Update mongo driver and fix deprecations

Description

Update mongo driver and fix deprecations. Also set version of installed tools in variables.

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

controller/nucleus/database/mongo-connection.go

@@ -20,16 +20,11 @@ const (
 // GetMongoConnection Retrieves a client to the MongoDB.
 func GetMongoConnection() (*mongo.Client, context.Context, context.CancelFunc) {
 	mongoConnection := config.DatabaseConnection
-	client, err := mongo.NewClient(options.Client().ApplyURI(mongoConnection))
-	if err != nil {
-		log.Printf("Failed to create client: %v", err)
-	}
-
 	ctx, cancel := context.WithTimeout(context.Background(), connectTimeout*time.Second)
 
-	err = client.Connect(ctx)
+	client, err := mongo.Connect(ctx, options.Client().ApplyURI(mongoConnection))
 	if err != nil {
-		log.Printf("Failed to connect to cluster: %v", err)
+		log.Printf("Failed to create client: %v", err)
 	}
 
 	// Force a connection to verify our connection string